Bit of a weird one here folks - got two garages stumped.
The zaf has been using load of oil for over 6 months now, no leaks and dose not appear to be burning it - no smoke at all.
When i was checking the levels the other night i noticed something odd. When i went to refit the oil filler cap, it was kind of sucked back on like avacuum, I lifted it off several times and there is a vacuum being created. The revs also drop when the cap is on but go back up when the cap is off.
anyone have any ideas?
The zaf has been using load of oil for over 6 months now, no leaks and dose not appear to be burning it - no smoke at all.
When i was checking the levels the other night i noticed something odd. When i went to refit the oil filler cap, it was kind of sucked back on like avacuum, I lifted it off several times and there is a vacuum being created. The revs also drop when the cap is on but go back up when the cap is off.
anyone have any ideas?
